This unusual crochet hook is carved of real ivory (not bone). The top is carved with a swiveling ring, perhaps so it could be hung on a ribbon. The detail of the whole piece is very fine. The condition is excellent with no chips, cracks or other damage and it was purchased in England. It measures 5 1/8" long and has nice ivory grain and patina. The hook is about the same as an American size G (4.50 mm).